#include <iostream>
#include <string>
using namespace std;

int main(int argc, char **argv)
{
    cout << "start" << endl;
    std::string test_s = "123456";
    cout << test_s.length() -6<< endl;
    cout << test_s.substr(test_s.length() - 6, test_s.length()) << endl;
    return 0;
}